Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Free Radical, High Pressure Polymerization of Ethylenes. The Effects of Initiator Concentration, Monomer Concentration and Pressure on the Polymerization RateRobert O. Symcox and Paul. EhrlichCite this: J. Am. Chem. Soc. 1962, 84, 4, 531–536Publication Date (Print):Febru…
"Introduction to Nuclear Engineering." Nuclear Science and Engineering, 12(2), p. 319 Additional informationNotes on contributorsGlen J. Schoessow(About the Reviewer: Glen Schoessow received his M.S. degree in engineering from Purdue in 1933. He began his career in nuclear engineering starting with the Brookhaven reac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeat Capacities and Thermodynamic Functions of Iron Disulfide (Pyrite), Iron Diselenide, and Nickel Diselenide from 5 to 350°K. The Estimation of Standard Entropies of Transition Metal ChalcogenidesFredrik Gronvold and Edgar F. WestrumCite this: Inorg. Chem. 1962, 1, 1, 36–4…
Abstract Enthalpies and free energies of formation of a group of aliphatic fluorocarbons and their radicals for 298.15°K. and the ideal gaseous condition are calculated from the available experimental heat and entropy data, extended by means of empirical series treatments. The polymerization of tetrafluoroethylene and…
The dependencies of intensity of emission of Eu3+ upon its concentration have been examined for several oxide systems which differ in structural arrangements and cation charge type. The data show that concentration quenching increases with the rise of perturbing influences which probably result from the mixing of the…
The thin film transmission electron microscope technique has been used to make a quantitative study of neutron damage in copper. The density of observable defect clusters has been measured as a function of diameter after various neutron doses between 0.61 × 1018 and 3.79 × 1018 fast n. cm−2. The total number of cluste…
By simultaneous diffraction is meant those diffraction effects which occur when a single crystal is so oriented that more than one Bragg reflection is operative for a given monochromatic ray. These effects often are apparent on films and may seriously modify intensity measurements in Geiger counter diffractometry. The…
Abstract The unit cell dimensions of a linear polyethylene are reported as determined by x‐ray diffraction measurements at five‐degree intervals from −70°C. to +130°C. and at −196°C. The relative expansion coefficient of the a dimension of the orthorhombic unit cell was found to increase from 1.1 × 10 −5 /°C. at −196°…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTRADIATION CHEMISTRY OF POLYETHYLENE. V. HYDROGEN ISOTOPE EXCHANGE STUDIESMalcolm Dole and Francis CraccoCite this: J. Phys. Chem. 1962, 66, 2, 193–201Publication Date (Print):February 1, 1962Publication History Published online1 May 2002Published inissue 1 February 1962https://p…
Copper specimens were subjected to large dynamic tensions by colliding relatively thin plates with thick plates holding the samples. The collision first produces strong shock waves, from 300 to 600 kbar, that propagate in both directions from the impact interface. Subsequent interaction of the two rarefaction waves re…
"Introduction to Nuclear Engineering." Nuclear Science and Engineering, 12(2), pp. 315–316
Hardness values of 65 nonmetallic crystalline solids of 16 different structures are compared with data of a newly introduced concept: "the volumetric lattice energy." When such solids are classified according to a new interpretation of lattice anharmonicity, a set of linear interrelations is obtained which covers the…
Abstract The molecular weight distributions of polypropylene samples subjected to various degrees of thermal degradation were experimentally determined and compared with those expected theoretically for random scission of the polymer chains. The comparison demonstrated that the chain breakage is predominately random a…
The structures of the crystalline regions of cold-drawn fibres and highly oriented, stretched rubberlike specimens of polyethylene adipate (PEA) and polyethylene suberate (PES) have been determined. The unit cells are monoclinic with one chemical unit per fibre repeat and two chains per cell. The cell dimensions are:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of Hydrogen by a Transition Metal Complex at Normal Conditions Leading to a Stable Molecular DihydrideL. Vaska and John W. DiLuzioCite this: J. Am. Chem. Soc. 1962, 84, 4, 679–680Publication Date (Print):February 1, 1962Publication History Published online1 May 20…
A study was made of the rate of diffusion of alkali ions into a soda‐lime glass from nitrate melts, and the distortion of glass disks produced by the stresses thus developed was measured using an interference technique. A maximum of 124,000 psi was produced when Na + was replaced by K + . Tensile stresses accompanying…
Abstract Interlayering of 2: 1 layer silicates varies as a function of chemical weathering from the simple, homogeneous K or Na interlayers of micas to the heterogeneous systems of mica intercalated with expanded 2: 1 layer silicates. “Frayed edge” type of weathering at dislocation planes of mica is collated with K re…
An experimental evidence was given for the segregation of solute atoms to stacking faults in alpha-brass. The stacking fault energy in an alpha-phase solid solution with face-centered cubic structure usually decreases continuously with the increasing concentration of solute atoms. The solute atoms in that alloy tend t…
The linear thermal expansion of a 99.999% gold bar has been measured throughout the range 15\ifmmode^\circ\else\textdegree\fi{} to 1057\ifmmode^\circ\else\textdegree\fi{}C by direct observation of the length expansion $\frac{\ensuremath{\Delta}L}{L}$, with filar micrometer microscopes and by measurement of the lattice…
The crystallographic and dielectric properties of complex perovskites are described in terms of average A- and B-site ionic radii, charges, and electronic structures. The relative importance of these to the ferroelectric state is evaluated by a study of a number of solid solutions containing trivalent bismuth. Two new…